Question about Sony FD Trinitron WEGA KD-36FS130 36" TV

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Tuner doesn't work

All of a sudden, in the middle of a show, the TV channel changed from 3 to 6. At first, I couldn't change it to any other channel. It just scrolled 6, 66, and 666. Now I can get the tuner to rest on a station, but it changes back in a few seconds, unless I lock it in, which is the poor solution I am implementing now, with channel 3 (for the cable). Anyone have an idea what's going on? Thanks.

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I think this may be more of a fault with the uPC area on the main board than a tuner failure. It is possible to have both at fault, but this would be rare.

The numbers you see on the screen is from a pre-scaler circuit that drives a font generator in one of the IC's near to the uPC area. If you see the numbers changing this more from the uPC than from the tuner iteslf.

Jerry G.

Posted on Apr 19, 2008

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